CN201374227Y

CN201374227Y - Ultra-high-voltage porcelain-bushing gapless zinc oxide arrester

Info

Publication number: CN201374227Y
Application number: CN200920012454U
Authority: CN
Inventors: 叶立茂; 刘起江; 张海滨; 王利民; 吕宏; 刘飞; 何维涛; 于清波; 孙光宝
Original assignee: FUSHUN ELECTRIC PORCELAIN MANUFACTURE Co Ltd
Current assignee: FUSHUN ELECTRIC PORCELAIN MANUFACTURE Co Ltd
Priority date: 2009-03-27
Filing date: 2009-03-27
Publication date: 2009-12-30
Anticipated expiration: 2019-03-27

Abstract

The utility model provides an ultra-high-voltage porcelain-bushing gapless zinc oxide arrester, which solves the problem that the prior porcelain-bushing gapless zinc oxide arrester, which is formed by connecting arrester elements less than four in series and fixing on the seat, can not be used in an AC (alternating current) ultra-high-voltage power grid because of the limits on energy absorption and protection performance. The key points of the utility model are as follows: the gapless zinc oxide arrester is formed by connecting five arrester elements in series; a voltage equalizing ring is arranged at the top end of the arrester; the interior of the arrester adopts a structure that four-post resistance chip posts are connected in parallel, and the four-post resistance chips in each element is divided into five units by a flow-equalizing connection plate; and a serially-connected capacitor set is arranged inside the arrester element, wherein the upper first section is connected in series with a four-post capacitor, the upper two sections are connected with a five-post capacitor, and the upper third sections are connected with a two-post capacitor in series. The zinc oxide arrester is applicable to 100kv AC ultra-high-voltage transmission engineering.

Description

Ultra-high voltage porcelain bushing type zero-clearance zinc oxide lightning arrester

Technical field

The utility model belongs to the extra-high-voltage alternating current zinc oxide arrester, and what be specifically related to is the porcelain bushing type zero-clearance zinc oxide lightning arrester that can be applicable to 1000 kilovolts of AC extra high voltage power transmission engineerings.

Background technology

In order further to optimize the electric power resource configuration, China will build 1000 kilovolts of AC extra high voltage electrical networks, realize that the electric power of trans-regional long-distance large-range is carried, and reduce electric quantity loss.1000 kilovolts of AC extra high voltage lightning arresters will have: absorb that energy is big, protective feature good, long-time running that can safety and stability.The present lightning arrester that uses in 750 kilovolts and following interchange EHV transmission engineering generally is by constituting after four joints and the following unit of an arrester series connection, and unit of an arrester inside is single-column resistor disc post.Limited because of its energy absorption and protective value, can't be applicable to the AC extra high voltage electrical network.

Summary of the invention

The purpose of this utility model is to provide a kind of ultra-high voltage porcelain bushing type zero-clearance zinc oxide lightning arrester.

The purpose of this utility model is achieved in that and comprises unit of an arrester, grading ring and base, it is characterized in that: it has five joint unit of an arrester to be composed in series, and every joint element internal has four columnar resistance sheet post parallel connections, is separated by backing plate between the element.

For absorption energy and the reduction equipment residual voltage that strengthens outfit of equipment improves protective value; the inner four columnar resistance sheet parallel-connection structures that adopt of lightning arrester; four columnar resistance sheets in every joint element are divided into five groups by the current-sharing connecting plate; because adopt the parallel connection of multicolumn resistor disc, it is very important making the mean allocation that flows through the resistor disc column current.Because the voltage on every layer of resistor disc post is all identical, so the distribution of energy equals to flow through the distribution of resistor disc column current; Simultaneously, the protection level is by the decision of the residual voltage of that post that flows through resistor disc column current maximum, so CURRENT DISTRIBUTION just can make the equipment protection performance better uniformly.We have adopted the method for accurate combo and one by one inspection, have guaranteed that current distribution factor is less than 1.08;

Lightning arrester voltage distributes directly influences the useful life of lightning arrester, owing to be applicable to that the height overall of the lightning arrester of 1000 kilovolts of AC extra high voltage power transmission engineerings reaches nearly 13 meters, this makes its stray electrical current over the ground more inhomogeneous, how to select grading ring structure and in parallel the benefit to taste electric capacity, it is just particularly important that its voltage is evenly distributed.The utility model adopts to reach at element internal parallel equalizing capacitor and outside grading ring dual mode all presses purpose, specifically: Shunt Capacitor Unit is arranged in unit of an arrester inside, wherein go up a joint four post capacitors in parallel, last two joints five post capacitors in parallel, last three joint and di-post capacitors.

Compared with prior art, the beneficial effects of the utility model are: energy absorption improves significantly, and Potential distribution is more even, has improved the protective value of lightning arrester greatly, is applicable to 1000 kilovolts of AC extra high voltage power transmission engineerings fully.

Description of drawings

Further specify the utility model below in conjunction with accompanying drawing.

Fig. 1 is a schematic diagram of the present utility model.

Fig. 2 is the structural representation of a joint unit of an arrester.

Fig. 3 is the installation diagram of the capacitor among Fig. 2.

Embodiment

Referring to Fig. 1, lightning arrester assembly height 13125mm, the height 2360mm of every joint unit of an arrester 2, maximum exumbrella footpath φ 750mm, gross weight 7500kg.Lightning arrester is made up of the separate element connected in series of five joints, is separated by backing plate between every joint element, and a grading ring 1 is equipped with on the lightning arrester top, and the bottom fixes by insulator foot and basis.

Grading ring is the Fourth Ring three-decker, and material is an aluminium alloy.Maximum loop external diameter φ 3660mm, submerged depth 2300mm, aluminum pipe external diameter φ 200mm.

Referring to Fig. 2, inner four posts, φ 136mm resistor disc 3 parallel-connection structures of adopting of lightning arrester, four columnar resistance sheets in every joint element are divided into five groups by current-sharing connecting plate 4; Every group by the four post parallel connections of connecting of 8-9 sheet, to guarantee that current distribution factor is less than 1.08.

Referring to Fig. 3, in last three joint unit of an arrester inside Shunt Capacitor Unit 5 is arranged, specifically: wherein go up a joint four post capacitors 51 in parallel, 40 ceramic capacitors of every post; Last two joints five post capacitors in parallel, 43 ceramic capacitors of every post; Last three joint and di-post capacitors, 40 ceramic capacitors of every post.

Performance of the present utility model such as following table

The utility model has improved the equipment protection level in 1000 kilovolt high-voltage AC transmission engineerings, reduced the external insulation level of main equipments such as transformer, has guaranteed the security reliability of transmission system and the reliability of long-time running.

Claims

1, a kind of ultra-high voltage porcelain bushing type zero-clearance zinc oxide lightning arrester comprises unit of an arrester, grading ring and base, it is characterized in that: it has five joint unit of an arrester to be composed in series, and is separated by backing plate between every joint element, on the top of lightning arrester grading ring is housed;

The inner four columnar resistance sheet parallel-connection structures that adopt of lightning arrester, four columnar resistance sheets in every joint element are divided into five groups by the current-sharing connecting plate;

In unit of an arrester inside Shunt Capacitor Unit is arranged, wherein go up a joint four post capacitors in parallel, last two joints five post capacitors in parallel, last three joint and di-post capacitors.

2, according to the described ultra-high voltage porcelain bushing type zero-clearance zinc oxide lightning arrester of claim 1, it is characterized in that: a said last joint four post capacitors in parallel, 40 ceramic capacitors of every post; Last two joints five post capacitors in parallel, 43 ceramic capacitors of every post; Last three joint and di-post capacitors, 40 ceramic capacitors of every post.

3, according to claim 1 or 2 described ultra-high voltage porcelain bushing type zero-clearance zinc oxide lightning arresters, it is characterized in that: said grading ring is the Fourth Ring three-decker, maximum loop external diameter φ 3660mm, submerged depth 2300mm, aluminum pipe external diameter φ 200mm.